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Conrad Johnson LP125 Mono Vacuum Tube Amplifier (pair) ExDemo

Conrad Johnson LP125 Mono Vacuum Tube Amplifier (pair) ExDemo

RRP: $11,998.00 (You save $4,498.00)
$50.00 (Fixed shipping cost)

Product Description

LP125 Mono Block Vacuum Tube Amplifiers EX Demo

Consistent with conrad-johnson’s design philosophy that circuits should be kept as simple as possible, the LP125M amplifier works its magic with a minimum of vacuum tubes (six). A composite triode input stage is direct coupled to a cathode-coupled phase inverter. The output stage is comprised of 6550s operated in ultra-linear configuration (two pair) for an optimal combination of high power and low distortion. Limited negative feedback is applied to the circuit to reduce distortion and provide a sufficiently high damping factor to control most real-world speaker systems. Discrete dc power supply regulators are provided for the input and inverter stages, in order to isolate each stage from the output signal.

As with all conrad-johnson tube amplifiers, the LP125M amplifier requires no complicated adjustments or specialized equipment to maintain. To assure continued peak performance, the owner need only make a simple bias adjustment when new tubes are installed. Built in LED bias indicators allow the user to make this adjustment using only the supplied screwdriver.

Component parts quality is a signature strength of any conrad-johnson product

The audio circuit and related power supplies feature precision metal film resistors and high-performance polypropylene capacitors. There are no electrolytic capacitors in the audio circuit or in the related power supplies. Proprietary wide-bandwidth output transformers contribute to excellent high frequency performance. Even the input/output connectors and internal wiring have been carefully selected for optimal sonic performance.

Conservatively rated at 60 watts per channel, the LP66S offers sufficient power for most applications.

Users who have not previously experienced the dynamic range and lifelike timbre of tubed components will find the LP66S an ideal introduction to the joys of modern tubed amplifiers. For those who do require more power, the LP125M mono-block delivers a solid 125 watts. Along with the tonal integrity and faithfulness to the music that are embodied in these amplifiers, their ease of use, low maintenance costs, and reliability will be a revelation for those who have only experienced “entry-level” tube gear.


  • Power: 125 watts from 30 Hz to 15 KHz at no more than 1.5 % THD when driven into 4 ohms (also available connected for 8 or 16 ohm loads)
  • Sensitivity: LP125M – 0.9V to rated power
  • Frequency Response: (at 10 watts): 20 Hz to 20 kHz, +/- .25 dB
  • Hum and Noise: 102 dB below rated power
  • Input Impedance: 100 kOhms
  • Tube Complement: 1 x M8080 | 1 x 6922 | 4 x 6550

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